Well, that is in the source code which means you will need to keep track of those changes before any SF update.
Also you cannot see the properties you want because their Modifiers are set by default to Friendly, if you can change it in the base class "MicroFour.StrataFrame.UI.Windows.Forms.ComboBox" to Public, then you will see them in any subclass.
Did I take my stupid pills today ?
If I can see these properties in the property sheet when designing a form, why can't I see them when writing code in the BD?
Just curious and trying to learn something.